Series episode
| Donnie Wahlberg | ... | Danny Reagan |
| Bridget Moynahan | ... | Erin Reagan-Boyle |
| Will Estes | ... | Jamie Reagan |
| Len Cariou | ... | Henry Reagan |
| Tom Selleck | ... | Frank Reagan |
| Dominic Chianese | ... | Happy Jack |
| Amy Carlson | ... | Linda Reagan |
| Nicholas Turturro | ... | Sgt. Anthony Renzulli |
| Robert John Burke | ... | Jyle Hogan |
| Dylan Moore | ... | Sydney Davenport |
| Robert Clohessy | ... | Sgt. Gormley |
| Michael Aronov | ... | Ricky Vintano |
| Sami Gayle | ... | Nicky Reagan-Boyle |
| James Biberi | ... | Kola |
| David Lee Russek | ... | Jimmy Costello |
| Joel Garland | ... | Street Light Andy |
| Peter J. Fernandez | ... | Inspector |
| George R. Sheffey | ... | Ganley |
| Kate Skinner | ... | Alice |
| Danny Hoch | ... | Billy Leo |
| Jennifer Esposito | ... | Jackie Curatola |
| Tony Terraciano | ... | Jack Reagan |
| Andrew Terraciano | ... | Sean Reagan |
| James Mena | ... | Aide |
| Maggie Steele | ... | NYPD Officer |
| Caleb Wallace | ... | Vincent Martin |
| Christian Wallace | ... | Vincent Martin |
| Todd Faulkner | ... | TARU Detective |
| Joe Gately | ... | Detective |
| Rodney Smith | ... | Detective |
| Darien Sills-Evans | ... | ESU Cop |
| Kelvin Hale | ... | Detective Hawks |
| Jamil Mena | ... | Cadet William Santiago |
| Todd Anthony | ... | Boyfriend |
| Steve Antonucci | ... | NYPD |
| Mike Catapano | ... | Detective |
| Scott Churchson | ... | Officer at Funeral |
| James Colby | ... | Walter Ryder |
| Peter Conboy | ... | NYPD Crime Tech |
| Paul DuBois | ... | Nervous Manager |
| Steven J. Klaszky | ... | Police Chief |
| Dee Dee Moss | ... | Tourist |
| Joseph Urban | ... | Manacled Prisoner |
| Alex Ziwak | ... | Undercover Detective |
| Ralph Hemecker | ... | Direction |
| Thomas Kelly | ... | Script |